It is totally out in England. Ask your local shop or go to a bigger city and ask thier shop. Or just go on Youtube and watch it!
My Favorite Crass album is 'Penis Envy' but for most people that is probably their least favorite. The girl in the band, Eve, it's her album and she sings the songs. Most of the other Crass albums are sung in a regular punk style by a dude. You should get 'Christ, The Album' too.